TPS63020: VINA

Martin Trainer

Part Number: TPS63020
Other Parts Discussed in Thread: TPS63805, TPS63070, TPS3839

Hi,

I would like to tune the UVLO of the TPS63020 to 3V. Can I place a voltage divider from VIN to VINA? I imagine this depends on the current and voltage requirements of the control stage as well as the internal series resistor between VIN and VINA.

Thanks

Martin

over 6 years ago

0 Julian Hagedorn over 6 years ago

TI__Mastermind 20900 points

Hi Martin,

VINA is supplying multiple internal circuits and it is not recommended to have a big voltage delta between VIN and VINA.
You can place a voltage divider on the EN pin to mimic a UVLO.

Check this app note: www.ti.com/.../slyt730.pdf

TPS63805 does have a precise EN feature.

Regards,
Julian

0 Martin Trainer over 6 years ago in reply to Julian Hagedorn

Prodigy 80 points

Hi Julian,

How precise is the EN feature on TPS63020? The datasheet specifies the minimum VIH of EN pin to be 1.2V but what is the Max?

Regards,
Martin

0 Milos over 6 years ago in reply to Martin Trainer

TI__Expert 7925 points

Hi Martin,

As you can see in the datasheet, the threshold for EN pin is somewhere between 0.4 V and 1.2 V. Therefore, it is not very precise, and is meant to be driven by a logic level signal.

1.2 V that you refer to is the maximum guaranteed threshold voltage.

The TPS63805 and TPS63070 have precise EN threshold. Otherwise you will have to use an additional comparator and a voltage reference, or a supply voltage supervisor (such as TPS3839).

Best regards,
Milos

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TPS63020: VINA